<template>
  <div>
    <ul>
      <li v-for='(item,index) in arr' :key="index">
        {{item}}
        <button @click="delBtn(index)">删除</button>
      </li>
    </ul>
    <button @click ="addBtn">生成</button>
  </div>
</template>

<script>
export default {
  data(){
    return{
      arr:[1,5,3]
    }
  },
  methods:{
   addBtn(){
    this.arr.push(Math.floor(Math.random() * 20))
   },
   delBtn(index){
    this.arr.splice(index,1)
   }
  }
}
</script>

<style>

</style>